Accumulator plate or grid.



No. 743,188. i PATBNTED 110V. s, 1903.

J. V011 111111 POPPBNBURG.

AGCUMULATOR PLATE 0R GRID. APPLICATION FILED MAY 13, 190s.

N0 MODEL.

y m Warney'.

UNITED STATES Patented November 3, 1903. A

PATENT GEEICE.

YJOHANNES voN DER POPPENRURG, or cHARLorTENRURG, NEAR RERLiN,

GERMANY.

ACCUNIULATOR PLATE OR GRID.

SPECIFICATION forming part of Letters Patent No. 743,188, dated November3, 1903. Application filed May 13,1903. Serial No. 156,932. (No model.)

To all whom, it may concern:

lowing is a full, clear, and exact description.

The present invention relates to the manuro facture of accumulatorplates or grids of that kind in which the active material, together withthe current-conductor embedded in it,

is inclosed by a frame made of some non-conductor of electricity, asdescribed in my I United States Patent No. 701,389. As it is impossibleto effect the mechanical connection between the frame and thecurrent-conductor l solely or chiefly by the active material or paste,this connection has been effected aczo cording to the aforesaid patentbymeans of l of accumulator-plates as compared with those of thewell-known construction, while at the same time increasing theireffective capacity. To this end the current-conductor i 3o is insertedin the frame itself in such manner or the frame is placed around theelectriccurrent conductor in such manner that both form a rigidmechanical body of sufficient strength. This connection is effected bydividing the frame in accordance with the shape and size of thecurrent-conductor or by providing it with a number of grooves, recesses,or holes, with which ribs or projections on the current-conductorengage. AfterV 4ou the current-conductor has been placed in the framethe parts of the frame are connected or its openings, which served forthe introduction of the conductor, closed with nonconducting material insuch manner as to effectually prevent any contact between thecurrent-conductor and the electrolyte, thus forcing the current to passexclusively through the active material and utilizing it to the fullestextent for the purposes of elec- 5o trochemical action. In this wayspecial crossbars for mechanically securing the conductor to the framebecome unnecessary and the Be it known thatI, JoHANNEsvoN DER PoP-PENBURG, a subject of the German Emperor, l and a resident lofCharlottenburg, near Ber 5 lin, Germany, have invented a new and use`ful Improvement in the Manufacture of Accumulator Plates or Grids, ofwhich the foll space generally occupied by them becomes available forthe active material, so that an increase of eective surface, and thus ofthe capacity of the electrode, is obtained. As, however, the closing ofthe joints of the frame parts must be done very carefully, it isnecessary in carrying out this invention to take care to avoid anysubdivision of the frame altogether or to make it in as few separateparts as possible.

My invention is illustrated by the accompanying drawings, in which-Figure 1 is an elevation of a grate-shaped current-conductor of anaccumulatorplate ,engaging with it. Fig. 4 is a cross-section on theline C D of Fig. 3. Fig. 5 is a cross-section on the line E F of Fig. 3.Fig. 6 is a cross-section on the line G H of Fig. 3, on a larger scale,showing the active material applied on both sides of the grating. Fig. 7is a view, partly in section, of the upper part of a modifiedconstruction according to this invention.

The current conductor or grating ct is shaped as shown in Figs. 1 and 2and consists of, say, two straight longitudinal bars b, with a number oftransverse bars c. The central portion of the transverse bars c is flat,while the ends d,projecting outward, are slightly curved or bent. Thetwo lateral portions e of the frame f, made of non-conductingmaterial-such as, for instance, vulcanized rubber-are provided ou theinside with a num ber of recesses g, of which there are as many and thecross-sectional shape of which is the same as that of the ends of thetransverse bars c of the conductor a. These recesses g are adapted toreceive-the free ends dof the transverse bars c.

The grating ct is secured to the framef iu the following manner: Theframe fis laid down on a fiat support h, Figs. 4 and 5, of glass or thelike, and a plate e', of aluminium or some other suitable material,which exactly fits in the frame, is placed in the latter, the thicknessof the plate being such that the lat- IOO

